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Thread: VW / Audi 1.8 20vt Map Sensor reading?

  1. #1
    Newbie
    Join Date
    Jan 2009
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    17

    VW / Audi 1.8 20vt Map Sensor reading?

    Hi there

    I'm working on a project for windows mobile that reads the sensor values via an elm327 bluetooth dongle. I've made a boost gauge and wanted to test it out on a mates Seat Ibiza 1.8t as he has a boost gauge fitted. After querying the ecu for supported PIDs, I found that it doesn't support a MAP sensor reading :-(

    I've been told its possible to read this using VAG-COM.

    Does anybody out there know if Scanguage is capable of reading the MAP sensor PID and what it does to read it?

    Cheers

    Simon

  2. #2
    Variable Bitrate
    Join Date
    Oct 2008
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    376
    If supported you can use pid $43 Absolute Load value.
    100% is 1 bar absolute = atmospheric pressure.
    200% is 2 bar absolute = 1 bar boost, etc.
    According to SAE J1979 this pid must be supported.

  3. #3
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    Quote Originally Posted by p2psmurf View Post
    If supported you can use pid $43 Absolute Load value.
    100% is 1 bar absolute = atmospheric pressure.
    200% is 2 bar absolute = 1 bar boost, etc.
    According to SAE J1979 this pid must be supported.
    That's very interesting, where did you find that out?
    Seeing as absolute load value goes up to 25,700%, I guess that will do it.
    Thanks, I'll give that a go.

  4. #4
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    Jan 2009
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    No luck, the absolute load value PID isn't supported by the ECU.
    I suppose if I new anything about how VAG-COM works, I could get at it that way.

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